<!DOCTYPE html>
<html>
<head>
<title>计算器</title>
<meta charset="UTF-8">
<meta name="viemport" content="width=device-width">
</head>
<body>
<input id="num1" /> * <input id="num2" />
<button onclick="jiSuan()">=</button>
<input id="num3" />

<script>
function jiSuan(){
	num3.value=num1.value * num2.value;
}
</script>

</body>
</html>